#include<iostream>
#include<cassert>
using namespace std;
string N;
unsigned long K;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin>>N>>K;
	K--;
	unsigned long low=1;
	for(int i=0;i<N.size();i++)low*=N[i]-'0'+1;
	string ret="";
	for(int i=0;i<N.size();i++)
	{
		low/=N[i]-'0'+1;
		char c=K/low+'0';
		K%=low;
		assert('0'<=c&&c<=N[i]);
		if(c!='0'||!ret.empty())ret+=c;
	}
	if(ret.empty())ret="0";
	cout<<ret<<endl;
}